PRODUCT  :  Borland C++                           NUMBER  :  1550
  VERSION  :  All
       OS  :  All
     DATE  :  October 25, 1993                         PAGE  :  1/2

    TITLE  :  Using Buffers with I/O String Streams




  // Using Buffers with I/O String Streams


  #include <iostream.h>
  #include <strstrea.h>
  #include <string.h>

  int main()
  {
          // note trailing space, since we will parse by spaces.
          char szInbuf0[] =  "Good Morning Vietnam ";

          // must pass _exact_ size of szInbuf0 into istrstream
          // ctor; strstream won't set eof until it has read that
          // number of bytes
          istrstream ins0(szInbuf0, strlen(szInbuf0));

          cout << "Reading in string mode:" << endl;
          char string1[20];
          ins0.getline(string1,20,' ');
          while (!ins0.eof())
          {
                  cout << string1 << endl;
                  ins0.getline(string1,20,' ');
          }

          cout << "Reading in char mode:" << endl;
          strcpy(szInbuf0, "Good Night Gracie");
          istrstream ins1(szInbuf0, strlen(szInbuf0));
          // note: if you need to know how much is left in the
          // buffer, use ins1.rdbuf()->in_avail() or
          ins1.rdbuf()->out_avail(); char c;
          ins1.get(c);
          while(!ins1.eof())
          {
                  cout <<  c << '.';
                  ins1.get(c);
          }
          cout << endl;

          // instead of constructing a new strstream, we
          // might think of just changing the buffer ... but
          // strstreambuf::setbuf() can't change your buffer













  PRODUCT  :  Borland C++                           NUMBER  :  1550
  VERSION  :  All
       OS  :  All
     DATE  :  October 25, 1993                         PAGE  :  2/2

    TITLE  :  Using Buffers with I/O String Streams




          // (it can only expand the buffer size.)

          // a dynamic i/o strstream; will be automatically
          // upsized as needed to accomodate more data
          char string2[20], string3[20];
          strstream s3;
          s3 << "New World Order!";
          s3 >> string1 >> string2 >> string3;
          cout << "Dynamic strstream: " << string1 << '.' <<
               string2 << '.' << string3 << endl;

          // putting a new string in

          // return both put & get pointers to beginning of buffer
          s3.seekp( 0, ios::beg );
          s3.seekg( 0, ios::beg );

          // clear eof bit
          s3.clear();

          // note: strstream buffer will _not_ be shrunk, so now
          // we have New Pizza Order! in the buffer
          s3 << "New Pizza";
          s3 >> string1 >> string2 >> string3;
          cout << "Dynamic strstream after reset: " << string1 <<
               '.' << string2 << '.' << string3 << endl;

          return 0;
  }


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